Lettieri Mariateresa, Masieri Maurizio, Frigione Mariaenrica
CNR-SPIN, SuPerconducting and Other INnovative Materials and Devices Institute, via Giovanni Paolo II 132, Fisciano, 84084 Salerno, Italy.
CNR-ISPC, Istituto di Scienze del Patrimonio Culturale, Prov.le Lecce-Monteroni, 73100 Lecce, Italy.
Nanomaterials (Basel). 2021 Jan 25;11(2):301. doi: 10.3390/nano11020301.
An experimental nano-filled coating, based on a fluorine resin containing SiO nano-particles, was applied on calcareous stones, representative of materials used in buildings and monuments of the Mediterranean basin; for comparison purposes, two commercial products were applied on the same substrates. The efficacy of the protective treatments was assessed by analyzing different characteristics of the three experimental/commercial products, i.e., color changes and permeability to water vapor to evaluate the treatments' harmlessness; capillary water absorption and water stone contact angle to evaluate the protection against water ingress; oleophobicity of the treated surfaces and the behavior under staining by acrylic blue-colored spray paint and felt-tip marker to verify the anti-graffiti action. Finally, the properties of the treated stone surfaces were analyzed also after the application of pancreatin, used to simulate bird excreta (guano). The protective coatings were found to promote graffiti removal, reducing also the detrimental effects due to simulated guano. The experimental nano-filled product, in addition, was able to provide outstanding performance but using smaller amounts of product in comparison to commercial systems.
一种基于含SiO纳米颗粒的氟树脂的实验性纳米填充涂层，被应用于钙质石材上，这些钙质石材是地中海盆地建筑和古迹中所用材料的代表；为作比较，两种商业产品也被应用于相同的基材上。通过分析这三种实验性/商业性产品的不同特性来评估防护处理的效果，即颜色变化和水蒸气渗透性以评估处理的无害性；毛细吸水和水与石材的接触角以评估防水侵入的保护效果；处理过的表面的疏油性以及在丙烯酸蓝色喷漆和毡尖笔染色下的表现以验证防涂鸦作用。最后，在施加用于模拟鸟粪（鸟排泄物）的胰蛋白酶后，也对处理过的石材表面的性能进行了分析。发现这些防护涂层有助于去除涂鸦，同时也减少了模拟鸟粪造成的有害影响。此外，与商业系统相比，实验性纳米填充产品能够以较少的产品用量提供出色的性能。
